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Test II PROBLEM SOLVING
Directions: Answer the question and show your complete solution in the separate paper.
1. Suppose the cells lining of your cheeks can completely di vide every 24 hours. Assuming no cells die in the
process, how many cheek cells will be there after 7 days if you started with 5 cheek cells?
2. If an organism has 15 pairs of homologous chromosomes, how many chromosomes will each
daughter cell have after telophase of mitosis?
Test I. Complete the concept in mitosis
has the
Cell division
Purpose of
which have
occurs in
through
(10.
condeneed
which Includes
or noncondensed
which include
5。
温
a loop of DNA
which Includes (in order)
which form
sister
9.
during
12.
(13.
14.
which is
followed by
15.
which Is
followed by
(16.
which includes (in order).
17.
19.
>(20.
What's New
In meiosis the cell goes through similar stages in mitosis and uses similar strategies to organize and separate
chromosomes. However, the cell has a more complex task in meiosis. It still needs to separate sister
chromatids (the two halves of a duplicated chromosome), as in mitosis. But it must also separate homologous
chromosomes, the similar but non-identical chromosome pairs an organism receives from its two parents.
These goals are accomplished in meiosis using a two-step division process. Homologue pairs separate
during a first round of cell division, called meiosis I. Sister chromatids separate during a second round,
called meiosis III. Since cell division occurs twice during meiosis, one starting cell can produce four gametes (eggs
or sperm). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase.
Stages of Meiosis I
In meiosis I, homologous chromosomes are separated into two cells such that there is one chromosome (consisting of